Pump governor



March 12, 194o l H ASWJ'UW4 2,193,705l

` PUMP GOVERNOR Filed Feb. 4, 1959 anc/r @E550/MMM@ j@ MaK/M INVENTOR Patented Mar. 12, 1940 UNITED srATEs PATENT oFFicE PUll/IP GOVERNOR Application February 4, 1939, Serial No. 254,528

2 Claims. (Cl. 103-19) This invention isv concerned with the provision of a regulating mechanism applicable to pumps to insure constancy of delivery therefrom at predetermined variable rates of delivery.v

The invention may be understood readily by reference to the drawing attached to the specification, which shows in diagram form a governor according to my invention.

In the drawing, l is the steam end oi the pump to be controlled; 2 is the steam line leading thereto; 3 is the control valve in the steam line. To operate the control valve there is used a diaphragm mechanism i of usual type, so mounted that increase of pressure upon the diaphragm or oi volume in the diaphragm chamber serves to open theI steam valve 3. Actuating fluid, any suitable liquid, is supplied to the diaphragm mechanism lby pipe 5 and originates in a sourcev of supply such as a constant speed pump 6, which may be, for example, a centrifugal pump driven by a synchronous motor or a variable stroke reciprocating pump, or other pump or pumps suitable for predetermined constant volume delivery. This pump derives its supply of liquid by pipe 'l from reservoir 8. A second pipe 9 communicates With the liquid space of diaphragm mechanism i and leads to secondary pilot pump it, Which is a reciprocating pump directly connected to governed vpump l by some linkage such as Il. Liquid Withdrawn from i by pump I0 is returned to reservoir 3 by pipe i2 in which any suitable back pressure, if desired or felt necessary, may be held by a valve I3.

In operation, a selected or predetermined displacement for pump 6, which corresponds to desired discharge rate of pump l is arranged for, for example by throttling the constant speed pump l. This delivers a constant volume of liquid per unit of time to controller d. Secondary pilot pump it removes liquid from 4 at a rate entirely concurrent with the speed (and rate of delivery) of pump l. If pump lil does not remove liquid from t as fast as it is supplied by pump d, then mechanism Il opens valve 3, increasing the rate of operation of pump l and consequently of pump lil. Conversely, 4 may act to decrease the speed of pump l. Other constant rates of operation of pump l may be achieved by selecting other rates oi displacement for primary pilot pump With modications readily apparent to those 'or a single primary pilot pump discharging through calibrated orices or the like, could be installed in ar central location for the service of a plurality of secondary pilot pumps each controlling the operation of an operation pump. Such a system would be readily adaptable to simultaneous proportional rate control of a number of pumps having interdependent functions,

as, for example, the several service pumps of a combination still in which petroleum oil is both cracked and primarily distilled.

I claim:

1. A control system to secure constant discharge at predetermined rate from a pump comprising a prime mover connected to said pump, means to supply energy to said prime mover, means to control the amount of energy so supplied, a variable volume chamber operatively connected to said control means whereby increases in volume of said chamber act to increase energy supply, a constant deliveryl liquid pump discharging into said volumetric chamber, and a third pump removing liquid from said volumetric chamber, said third pump being operatively connected with the controlled pump so that its rate of suction is parallelly proportionate to the rate of discharge of the controlled pump.

2. A control system to secure constant discharge at predetermined rate from a pump comprising a controlled pump, a prime mover therefor, rate control means on said prime mover, a diaphragm to operate said rate control, a oonstant speed pump of predetermined displacement to supply operative liquid to said diaphragm, a variable displacement pump to remove operative liquid from said diaphragm, a linkage between the controlled pump and the variable displacement pump Whereby the discharge rate of the second is maintained proportional and parallel to the rst, the said diaphragm being mounted to increase the rate of the controlled pump in response to a deficient rate of removal of liquid from saiddiaphragm.

JACK H. ASHLAND. 

